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#4583511 - 11/24/17 09:47 AM '07 Scion tC looks like burnt intake valves?
crazy_raccoon Offline


Registered: 08/26/17
Posts: 73
Loc: USA
When my buddy and I installed an aftermarket header a couple months ago we noticed the intake valves were white on the header side and it looks like some kind of deposit build up is there. Has anyone ever ran into this issue and found a good way to solve it without taking the engine apart? Usually when I see dirty intake valves they are black.

Status on vehicle:
- I do a lot of short trips because I don't live far from the base and did a lot of short intervals driving to different buildings within a couple of miles.
- Highway driving is usually less than 10 minutes a day because there is no need for me to be on there.
- I have a short ram intake that I've been running since 15,000 miles and car currently has 97,000.
- Valve cover gasket is leaking a little bit and I just switched to Valvoline FS w/Max Life 0W-20 because of the bad piston design and seals are probably old by now. (There's a TSB for oil consumption on these vehicles)

So yeah I'm just pretty curious if anyone has ever ran into thi before.
_________________________
'07 Scion tc
- 98K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM Ultra
'07 Honda Accord coupe 4cyl
- 120K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM Ultra

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#4583558 - 11/24/17 10:36 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2770
Loc: Wet side WA
That isn't going to help Toyota build on the good name is it?
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2004 Toyota Corolla 121790
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
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Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4583559 - 11/24/17 10:38 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
cronk Offline


Registered: 01/06/09
Posts: 1288
Loc: Watertown, New York
If that is from the exhaust header side, those are exhaust valves.

If those are exhaust valves, than that looks normal.
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#4583561 - 11/24/17 10:40 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
BobsArmory Offline


Registered: 03/28/10
Posts: 1320
Loc: Michigan
Are you running any aftermarket additives in the oil and/or fuel?
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#4583571 - 11/24/17 10:51 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
DuckRyder Offline


Registered: 10/20/05
Posts: 4215
Loc: Atlanta
Intake valves do not burn

That picture does not show a burned valve (at least you canít see if it is burned)

You canít fix a burned valve without removing it
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Robert
  • 2007 Toyota Prius Touring
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#4583572 - 11/24/17 10:52 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
rooflessVW Offline


Registered: 12/24/11
Posts: 4078
Loc: North Carolina
Looks like normal exhaust valves to me.
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"Zed's dead baby, Zed's dead."

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#4583579 - 11/24/17 11:04 AM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
SubLGT Offline


Registered: 01/31/06
Posts: 2646
Loc: Idaho
Originally Posted By: crazy_raccoon
When my buddy and I installed an aftermarket header a couple months ago we noticed the intake valves were white on the header side...


You can't generally see the intake valves from the "header side". Those look like normal exhaust valves.


Edited by SubLGT (11/24/17 11:07 AM)

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#4583622 - 11/24/17 12:13 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: Kalifornia Kollective
A bit white to me, but not terrible. I'd like to see tan instead ... Only a tuner chip with a slight increase in air/fuel ratio will get there ...

The changes you are making are likely leaning it out some. The ECU is not compensating ...


Edited by BrocLuno (11/24/17 12:14 PM)
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#4583628 - 11/24/17 12:23 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
Unless the engine has both manifolds on the same side, which is uncommon in more recent decades as it's less efficient, you're looking at the exhaust valves and unless you have a misfire your valves aren't burned. That's probably just a sign of a good clean burn.

When a valve burns, is when part of the shoulder (where it contacts the seat) begins eroding giving combustion gasses a route to escape and compression loss is the result. Intake valves are exposed to cooler air and gasoline (except in DI) passing over them so run cool enough that they almost never burn.


Edited by Alex_V (11/24/17 12:24 PM)
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#4583644 - 11/24/17 12:36 PM Re: '07 Scion tC looks like burnt intake valves? [Re: SubLGT]
Linctex Offline


Registered: 12/31/16
Posts: 6176
Loc: Waco, TX
Originally Posted By: SubLGT
Originally Posted By: crazy_raccoon
When my buddy and I installed an aftermarket header a couple months ago we noticed the intake valves were white on the header side...


You can't generally see the intake valves from the "header side". Those look like normal exhaust valves.


Yep - those are "Normal" EXHAUST valves, yo.... dude
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#4583665 - 11/24/17 12:51 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
Crispysea Offline


Registered: 04/14/17
Posts: 403
Loc: TN USA
They look good to me, too, especially for 97K miles. Dirty valves look way worse than those.

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#4583695 - 11/24/17 01:22 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
Quest Offline


Registered: 12/19/04
Posts: 7383
Loc: beaver land EH?
2 things of note:

(1) the picture showed seems to be the exhaust port (exhaust valves), not intake.

(2) when in doubt: always perform compression checks.

Q.
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#4583748 - 11/24/17 02:46 PM Re: '07 Scion tC looks like burnt intake valves? [Re: rooflessVW]
Trav Offline


Registered: 11/20/06
Posts: 18903
Loc: MA, Mittelfranken.de
Originally Posted By: rooflessVW
Looks like normal exhaust valves to me.


+1
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#4583774 - 11/24/17 03:24 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
Those aren't intake valves, they're exhaust valves. Their color and slight buildup are both perfectly normal.
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P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4583941 - 11/24/17 07:11 PM Re: '07 Scion tC looks like burnt intake valves? [Re: crazy_raccoon]
TinyVoices Offline


Registered: 09/12/16
Posts: 486
Loc: Vienna, VA
Will resonate with everyone here. Those look like perfectly normal exhaust valves for a 2az engine. We have had a few of these apart and they looked similar. No issue to report on your car.
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1993 Toyota MR2 Hardtop N/A - 157k miles - Valvoline Max Life 5w30
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